Several merchant vessels have borne the name Diadem, after the Diadem, a type of crown:
Diadem was a sloop launched in 1798. The Admiralty renamed her HMS Falcon after purchasing her in 1801 to avoid confusion with the pre-existing third rate Diadem. Falcon served in the north Atlantic and the Channel, and then in Danish waters during the Gunboat War. She was sold in 1816. Her new owner renamed her Duke of Wellington and sailed her to the Indies under a license from the British East India Company. She was wrecked in 1820 at Batavia.
Atlas was built in Souths Shields by Temple and launched in 1801 for Temple. She made two voyages transporting convicts from Ireland or England to Port Jackson. On the first voyage she carried cargo for the British East India Company (EIC). On the second she sailed to Bengal after delivering her convicts to New South Wales and was wrecked off India in 1820 while on her way back to Britain.
Perseus was a sailing ship built in 1799 at Stockton-on-Tees, England. She made one voyage transporting convicts to New South Wales, returning to England via Canton. In 1803-1804 she served as an "armed defense ship". Thereafter she served as a transport. She is last listed in 1844.
Indian was a merchant ship launched at Shields in 1810. Her first voyage was to transport convict convicts to Australia. She then became a West Indiaman. She wrecked with heavy loss of life on 8 December 1817.
Indefatigable was a square-rigged, three-decked, three-masted merchant ship launched in 1799 at Whitby for James Atty & Co. for the West Indies trade. In 1804 she served as an armed defense ship and recaptured a merchantman that a privateer had captured. She was a transport in the 1805–1806 British invasion of the Dutch Cape colony. She twice transported convicts to Australia; on the first trip she was chartered to the British East India Company (EIC). She burned to the waterline in 1815.
Asia was a merchant barque built at Whitby in 1813. She made one voyage to India for the British East India Company (EIC) in 1820–21, and one voyage to Van Diemen's Land in 1827–28. Asia then traded to the Mediterranean, but mostly to Quebec. She was last listed in 1850.
HMS Scourge was the former merchant sloop Herald, launched in 1799, that the Admiralty purchased in 1803 for service as a convoy escort. The Admiralty had her laid up in 1805, and sold in 1816. Subsequent owners returned her to mercantile service and she sailed until 1835 when she was lost.
Shipley was launched in 1805 at Whitby. A privateer captured Shipley in 1806 on what was probably her maiden voyage, but the British Royal Navy recaptured her. Between 1817 and 1823, she made four voyages transporting convicts to New South Wales. The ship was wrecked in 1826.
Diadem was a barque launched in 1800 at Whitby. She served as an armed defence ship between 1803 and 1805. Her owners sold her to the British government in 1818. The year 1818 may be a transcription error for 1808 as that is the last year for which Diadem is listed in either Lloyd's Register or the Register of Shipping.
Camden was built at Whitby in 1813. She served as a general trader for much of her career, though in 1820-21 she made one voyage to Bombay for the British East India Company (EIC). Between 1833 and 1837 she was a Greenland whaler out of the Whitby whale fishery, and was the last vessel from Whitby to engage in whaling. She was last listed in Lloyd's Register in 1850.
Latona was launched at Whitby in 1789. She made one voyage for the British East India Company (EIC), and one as a whaling ship in the southern whale fishery. She spent the rest of her career as a merchantman. She was wrecked in 1841.
Brunswick was launched at Newcastle in 1795. She made one voyage as an "extra ship", i.e., under charter, to the British East India Company (EIC). She then traded generally until she foundered in 1809.
Suffolk was launched in 1795 at Newcastle. In 1800 she made one voyage for the British East India Company (EIC). She traded widely as different owners deployed her on one route or another.
Paragon was launched at Whitby in 1800. Between 1803 and 1805 she served as an armed defense ship protecting Britain's coasts and convoys. She then served as a transport on the 1805 naval expedition to capture the Cape of Good Hope. Next, she returned to mercantile service and in 1814 a French privateer captured her, but the British Royal Navy recaptured her the next day. She sailed to India in 1818 under a license from the British East India Company (EIC}, and was wrecked in March 1819 while inbound to Calcutta.
HMS Vulture was launched in 1801 at South Shields as Warrior. The Royal Navy purchased her in 1803 as a sloop and renamed her. From 1808 through 1813 she was a floating battery at Jersey,. The Navy sold her in 1814 and she returned to mercantile service as Warrior. She was last listed in 1820, but does not seem to have sailed again after returning from east of the Cape in 1817.
Harpooner was launched at Whitby in 1769, or possibly a few years later. Her early career is obscure. She may have been a Greenland whaler between 1786 and 1792. She appeared in Lloyd's Register in 1801, and thereafter traded across the Atlantic. She was wrecked in 1816 with heavy loss of life.
Lord Wellington was launched in 1811 at Whitby as a London-based transport. She made one voyage to India c. 1816. She sank in May 1823 after striking an iceberg in the North Atlantic.
Young William was launched at Whitby in 1779. Initially, she was a West Indiaman. Later she traded more widely, particularly to Russia and the Baltic. She was captured and recaptured in 1814 and was lost on Nargon Island in 1815.
William and Ann was launched in 1781 at Whitby. From her launch until 1805 she alternated between being a transport and trading with the Baltic. In 1805 she became a whaler in the northern whale fishery. She wrecked in ice in 1830 in the Greenland fisheries on her 24th whaling voyage.
Several vessels have been named Camilla: